Signal Transmitting and Receiving Apparatuses

1. A signal transmitting apparatus comprising: an inverse discrete Fourier transform module for receiving modulated data, performing inverse discrete Fourier transform, and generating a first symbol; a cyclic prefix adding module for adding a predetermined cyclic prefix to the first symbol, and generating a second symbol; a preamble adding module for adding a predetermined preamble to the second symbol, and generating a third symbol; and a digital-analog converting hardware module for converting the third symbol including the cyclic prefix and the preamble into an analog symbol, wherein the preamble is arranged to be used by a receiving apparatus to compensate, by a time domain analysis, synchronization and a phase of data received by the receiving apparatus, followed by usage of the cyclic prefix by the receiving apparatus to compensate, by another time domain analysis, a sampling clock signal error and the phase of the data.

2. The signal transmitting apparatus of claim 1 , wherein a short preamble is used as the preamble, and it is added to a former part of the second symbol since there is delay in a wireless environment.

3. The signal transmitting apparatus of claim 1 , wherein the cyclic prefix is determined by considering a delay to a cell boundary area.

4. The signal transmitting apparatus of claim 1 , wherein the cyclic prefix and the preamble may have variable periods.

5. A signal transmitting apparatus comprising: an inverse discrete Fourier transform module configured to receive modulated data and generate a first symbol by performing inverse discrete Fourier transform on the received data; a cyclic prefix adding module configured to generate a second symbol by adding a predetermined cyclic prefix to the first symbol; a preamble adding module configured to generate a third symbol by adding a predetermined preamble to the second symbol; and a digital-analog converting hardware module configured to convert the third symbol into an analog symbol, wherein the preamble is arranged to be used by a receiving apparatus to compensate, by a time domain analysis, synchronization and a phase of data received by the receiving apparatus, followed by usage of the cyclic prefix by the receiving apparatus to compensate, by another time domain analysis, a sampling clock signal error and the phase of the data.

6. A signal transmitting method comprising: receiving modulated data; generating a first symbol by performing inverse discrete Fourier transform on the received data generating, by a cyclic prefix adding module, a second symbol by adding a predetermined cyclic prefix to the first symbol; generating a third symbol by adding a predetermined preamble to the second symbol; and converting, by a digital-analog converting module, the third symbol into an analog symbol, wherein the preamble is arranged to be used by a receiving apparatus to compensate, by a time domain analysis, synchronization and a phase of data received by the receiving apparatus, followed by usage of the cyclic prefix by the receiving apparatus to compensate, by another time domain analysis, a sampling clock signal error and the phase of the data.